ST. JOHN’S—Bright yellow and slate blue Canada warblers have been flying out of the boreal forest in the past few months heading south for the winter. These tiny songbirds are strong enough to make a thousand-mile, nonstop flight over the Atlantic Ocean, yet they are struggling in the face of another challenge: the disappearance of wild places along their migration route. As human development encroaches on their habitat, the Canada warbler population has dropped by 80 per cent in recent decades.
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